Income Taxes - Reconcilliation of Effective Income Tax Rate (Details)	12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	32.70%		35.00%	35.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent	1.60%		0.70%	0.40%
State income taxes, net of federal income tax benefit	0.40%		0.40%	(1.50%)
Benefit of Section 199 of the Code, manufacturing deduction	(2.20%)		(2.30%)	(2.70%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	0.00%		0.00%	(1.20%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	(0.50%)	(1.80%)	0.00%
Other	0.20%		0.10%	(0.20%)
Effective income tax rate	(46.20%)		28.20%	26.20%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(7.70%)		(3.10%)	(3.20%)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	(0.40%)		(0.80%)	(0.40%)